<template>
	<view class="container">
		<!-- 空白页 -->
		<view v-if="!loginState || empty===true" class="empty">
			<image src="/static/images/emptyCart.jpg" mode="aspectFit"></image>
			<view v-if="loginState" class="empty-tips">
				空空如也
				<navigator class="navigator" v-if="loginState" url="../index/index" open-type="switchTab">随便逛逛>
				</navigator>
			</view>
			<view v-else class="empty-tips">
				空空如也
				<view class="navigator" @click="navToLogin">去登陆></view>
			</view>
		</view>
		<view v-else>
			<!-- 列表 -->
			<view class="cart-list">
				<block v-for="(item, index) in cartList" :key="item.id">
					<view class="cart-item" :class="{'b-b': index!==cartList.length-1}">
						<view class="image-wrapper">
							<image :src="item.image" :class="[item.loaded]" mode="aspectFill" lazy-load
								@load="onImageLoad('cartList', index)" @error="onImageError('cartList', index)"></image>
							<view class="yticon icon-xuanzhong2 checkbox" :class="{checked: item.checked}"
								@click="check('item', index)"></view>
						</view>
						<view class="item-right">
							<text class="clamp title">{{item.title}}</text>
							<text class="attr">{{item.attr_val}}</text>
							<text class="price">¥{{item.price}}</text>
							<uni-number-box class="step" :min="1" :max="item.stock"
								:value="item.number>item.stock?item.stock:item.number"
								:isMax="item.number>=item.stock?true:false" :isMin="item.number===1" :index="index"
								@eventChange="numberChange"></uni-number-box>
						</view>
						<text class="del-btn yticon icon-fork" @click="deleteCartItem(index)"></text>
					</view>
				</block>
			</view>
			<!-- 底部菜单栏 -->
			<view class="action-section">
				<view class="checkbox">
					<image :src="allChecked?'/static/images/selected.png':'/static/images/select.png'" mode="aspectFit"
						@click="check('all')"></image>
					<view class="clear-btn" :class="{show: allChecked}" @click="clearCart">
						清空
					</view>
				</view>
				<view class="total-box">
					<text class="price">¥{{total}}</text>
				</view>
				<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
			</view>
			
			<u-gap height="80" bgColor="#f0f0f0"></u-gap>
		</view>
	</view>
</template>

<script>
	import {
		mapState
	} from 'vuex'
	import uniNumberBox from '@/components/uni-number-box.vue'
	export default {
		components: {
			uniNumberBox
		},
		computed: {
			...mapState(['loginState', 'userInfo'])
		},
		data() {
			return {
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: false, //空白页现实  true|false
				cartList: [{
						id: 1,
						image: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1553005139&di=3368549edf9eee769a9bcb3fbbed2504&imgtype=jpg&er=1&src=http%3A%2F%2Fimg002.hc360.cn%2Fy3%2FM01%2F5F%2FDB%2FwKhQh1T7iceEGRdWAAAAADQvqk8733.jpg',
						attr_val: '春装款 L',
						stock: 15,
						title: 'OVBE 长袖风衣',
						price: 278.00,
						number: 1
					},
					{
						id: 3,
						image: 'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2319343996,1107396922&fm=26&gp=0.jpg',
						attr_val: '激光导航 扫拖一体',
						stock: 3,
						title: '科沃斯 Ecovacs 扫地机器人',
						price: 1348.00,
						number: 5
					},
					{
						id: 4,
						image: 'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2668268226,1765897385&fm=26&gp=0.jpg',
						attr_val: 'XL',
						stock: 55,
						title: '朵绒菲小西装',
						price: 175.88,
						number: 1
					},
					{
						id: 5,
						image: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1552410549432&di=06dd3758053fb6d6362516f30a42d055&imgtype=0&src=http%3A%2F%2Fimgcache.mysodao.com%2Fimg3%2FM0A%2F67%2F42%2FCgAPD1vNSsHNm-TnAAEy61txQb4543_400x400x2.JPG',
						attr_val: '520 #粉红色',
						stock: 15,
						title: '迪奥（Dior）烈艳唇膏',
						price: 1089.00,
						number: 1
					},
					{
						id: 6,
						image: 'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1031875829,2994442603&fm=26&gp=0.jpg',
						attr_val: '樱花味润手霜 30ml',
						stock: 15,
						title: "欧舒丹（L'OCCITANE）乳木果",
						price: 128,
						number: 1
					},
					{
						id: 7,
						image: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1553007107&di=390915aa8a022cf0b03c03340881b0e7&imgtype=jpg&er=1&src=http%3A%2F%2Fimg13.360buyimg.com%2Fn0%2Fjfs%2Ft646%2F285%2F736444951%2F480473%2Faa701c97%2F548176feN10c9ed7b.jpg',
						attr_val: '特级 12个',
						stock: 7,
						title: '新疆阿克苏苹果 特级',
						price: 58.8,
						number: 10
					},
					{
						id: 8,
						image: 'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2319343996,1107396922&fm=26&gp=0.jpg',
						attr_val: '激光导航 扫拖一体',
						stock: 15,
						title: '科沃斯 Ecovacs 扫地机器人',
						price: 1348.00,
						number: 1
					},
					{
						id: 9,
						image: 'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2668268226,1765897385&fm=26&gp=0.jpg',
						attr_val: 'XL',
						stock: 55,
						title: '朵绒菲小西装',
						price: 175.88,
						number: 1
					},
					{
						id: 10,
						image: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1552410549432&di=06dd3758053fb6d6362516f30a42d055&imgtype=0&src=http%3A%2F%2Fimgcache.mysodao.com%2Fimg3%2FM0A%2F67%2F42%2FCgAPD1vNSsHNm-TnAAEy61txQb4543_400x400x2.JPG',
						attr_val: '520 #粉红色',
						stock: 15,
						title: '迪奥（Dior）烈艳唇膏',
						price: 1089.00,
						number: 1
					},
					{
						id: 11,
						image: 'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1031875829,2994442603&fm=26&gp=0.jpg',
						attr_val: '樱花味润手霜 30ml',
						stock: 15,
						title: "欧舒丹（L'OCCITANE）乳木果",
						price: 128,
						number: 1
					},
					{
						id: 12,
						image: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1553007107&di=390915aa8a022cf0b03c03340881b0e7&imgtype=jpg&er=1&src=http%3A%2F%2Fimg13.360buyimg.com%2Fn0%2Fjfs%2Ft646%2F285%2F736444951%2F480473%2Faa701c97%2F548176feN10c9ed7b.jpg',
						attr_val: '特级 12个',
						stock: 7,
						title: '新疆阿克苏苹果 特级',
						price: 58.8,
						number: 10
					},
					{
						id: 13,
						image: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1552405266625&di=a703f2b2cdb0fe7f3f05f62dd91307ab&imgtype=0&src=http%3A%2F%2Fwww.78.cn%2Fzixun%2Fnews%2Fupload%2F20190214%2F1550114706486250.jpg',
						attr_val: '春装款/m',
						stock: 15,
						title: '女装2019春秋新款',
						price: 420.00,
						number: 1
					}
				]
			};
		},
		onShow() {
			if (this.loginState) {
				// this.loadData();
			}
		},
		watch: {
			//显示空白页
			cartList(e) {
				let empty = e.length === 0 ? true : false;
				if (this.empty !== empty) {
					this.empty = empty;
				}
			}
		},
		methods: {
			//请求数据
			async loadData() {
				let list = await this.$api.json('cartList');
				let cartList = list.map(item => {
					item.checked = true;
					return item;
				});
				this.cartList = cartList;
				this.calcTotal(); //计算总价
			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = '/static/images/errorImage.jpg';
			},
			navToLogin() {
				uni.navigateTo({
					url: '/subpackages/login-page/login-page'
				})
			},
			//选中状态处理
			check(type, index) {
				if (type === 'item') {
					this.cartList[index].checked = !this.cartList[index].checked;
				} else {
					const checked = !this.allChecked
					const list = this.cartList;
					list.forEach(item => {
						item.checked = checked;
					})
					this.allChecked = checked;
				}
				this.calcTotal(type);
			},
			//数量
			numberChange(data) {
				this.cartList[data.index].number = data.number;
				this.calcTotal();
			},
			//删除
			deleteCartItem(index) {
				let list = this.cartList;
				let row = list[index];
				let id = row.id;

				this.cartList.splice(index, 1);
				this.calcTotal();
				uni.hideLoading();
			},
			//清空
			clearCart() {
				uni.showModal({
					content: '清空购物车？',
					success: (e) => {
						if (e.confirm) {
							this.cartList = [];
						}
					}
				})
			},
			//计算总价
			calcTotal() {
				let list = this.cartList;
				if (list.length === 0) {
					this.empty = true;
					return;
				}
				let total = 0;
				let checked = true;
				list.forEach(item => {
					if (item.checked === true) {
						total += item.price * item.number;
					} else if (checked === true) {
						checked = false;
					}
				})
				this.allChecked = checked;
				this.total = Number(total.toFixed(2));
			},
			//创建订单
			createOrder() {
				let list = this.cartList;
				let goodsData = [];
				list.forEach(item => {
					if (item.checked) {
						goodsData.push({
							attr_val: item.attr_val,
							number: item.number
						})
					}
				})

				uni.navigateTo({
					url: `/pages/order/createOrder?data=${JSON.stringify({
						goodsData: goodsData
					})}`
				})
				this.$api.msg('跳转下一页 sendData');
			}
		}
	}
</script>

<style lang='scss' scoped>
	.container {
		padding-bottom: 134upx;

		/* 空白页 */
		.empty {
			position: fixed;
			left: 0;
			top: 0;
			width: 100%;
			height: 100vh;
			padding-bottom: 100upx;
			display: flex;
			justify-content: center;
			flex-direction: column;
			align-items: center;
			background: #fff;

			image {
				width: 240upx;
				height: 160upx;
				margin-bottom: 30upx;
			}

			.empty-tips {
				display: flex;
				font-size: $uni-font-size-sm+2px;
				color: $uni-text-color-disable;

				.navigator {
					color: $uni-color-primary;
					margin-left: 16upx;
				}
			}
		}
	}

	/* 购物车列表项 */
	.cart-item {
		display: flex;
		position: relative;
		padding: 30upx 40upx;

		.image-wrapper {
			width: 230rpx;
			height: 230rpx;
			flex-shrink: 0;
			position: relative;

			.loaded {
				width: 230rpx;
				height: 230rpx;
			}
			
			image {
				border-radius: 8upx;
			}
		}

		.checkbox {
			position: absolute;
			left: -16upx;
			top: -16upx;
			z-index: 8;
			font-size: 44upx;
			line-height: 1;
			padding: 4upx;
			color: $uni-text-color-disable;
			background: #fff;
			border-radius: 50px;
		}

		.item-right {
			display: flex;
			flex-direction: column;
			flex: 1;
			overflow: hidden;
			position: relative;
			padding-left: 30upx;

			.title,
			.price {
				font-size: $uni-font-size-sm + 2px;
				color: $uni-text-color;
				height: 40upx;
				line-height: 40upx;
				overflow: hidden;
				text-overflow: ellipsis;
				white-space: nowrap;
			}

			.attr {
				font-size: $uni-font-size-sm + 2px;
				color: $uni-text-color-disable;
				height: 50upx;
				line-height: 50upx;
			}

			.price {
				height: 50upx;
				line-height: 50upx;
				color: $uni-text-color-placeholder;
			}
		}

		.del-btn {
			padding: 4upx 10upx;
			font-size: 34upx;
			height: 50upx;
			color: $uni-text-color-disable;
		}
	}

	/* 底部栏 */
	.action-section {
		/* #ifdef H5 */
		margin-bottom: 100upx;
		/* #endif */
		position: fixed;
		left: 0upx;
		bottom: 0upx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 100%;
		height: 100upx;
		/* padding: 0 30upx; */
		background: rgba(255, 255, 255, .9);
		box-shadow: 0 0 10upx 0 rgba(0, 0, 0, .5);
		border-radius: 0upx;

		.checkbox {
			height: 52upx;
			position: relative;
			margin-left: 12px;
			
			image {
				width: 52upx;
				height: 100%;
				position: relative;
				z-index: 5;
			}
		}

		.clear-btn {
			position: absolute;
			left: 26upx;
			top: 0;
			z-index: 4;
			width: 0;
			height: 52upx;
			line-height: 52upx;
			padding-left: 38upx;
			font-size: $uni-font-size-base;
			color: #fff;
			background: $uni-text-color-disable;
			border-radius: 0 50px 50px 0;
			opacity: 0;
			transition: .2s;

			&.show {
				opacity: 1;
				width: 120upx;
			}
		}

		.total-box {
			flex: 2;
			display: flex;
			flex-direction: column;
			text-align: right;
			padding-right: 40upx;

			.price {
				font-size: $uni-font-size-lg;
				color: $font-color-dark;
			}

			.coupon {
				font-size: $uni-font-size-sm;
				color: $font-color-light;

				text {
					color: $font-color-dark;
				}
			}
		}

		.confirm-btn {
			flex: 1;
			width: 100px;
			padding: 0 38upx;
			margin: 0;
			border-radius: 100px;
			height: 76upx;
			line-height: 76upx;
			font-size: $uni-font-size-base + 2px;
			background: $uni-color-primary;
			box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72)
		}
	}

	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked {
		color: $uni-color-primary;
	}
</style>